[PH7.0] Lift the public open space in urban area !!!

Some outdoor spaces in urban area are often wasted for just single function like parking lot or park. Of course it's good to have these spaces in urban area to fulfill our needs, but it's even better to introduce more functions to a existing open space for increasing the uses of the site. Especially for the public open space in urban area, the existing open space can be lifted, and the new functions can be added under this existing "layer". A multi-layered open space can create more attraction for people to come because of its variety of functions. It's always very important to enhance the capacity of the existing public open spaces in the city center because in such area surrounded by private spaces people really need more places where everybody can go there. By lifting the existing public open space, the increasing needs of public service can also be served. Public functions like parking lots, information center and green space can be integated together under the existing layer.